D. Singh, S. Hoh, S.L. Ng, A.L.Y. Low, F.L. Lim, and M. Singaram (Malaysia)
QoS, WLAN, VoIP, MOS, E-Model, SIP
In this paper we investigate how network performance impairments affect service quality as perceived by Voice over IP users. It examines the problems of providing QoS in wireless networks for VoIP applications and propose a solution whereby QoS is dealt with by the end terminals through adaptive application and end-to-end congestion control. A comparative study is conducted within similar adaptive QoS mechanisms in order to analyze the strengths and weaknesses of existing frameworks. We have set up an implementation test bed to simulate varying network conditions in order to evaluate the effectiveness of employing adaptive codec switching techniques. Mean Opinion Score values from the E-model are used to register observation as well as to determine the threshold to switch to a different codec when the audio quality is poor.
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